La2Mo2O9系新型氧离子导体中氧空位扩散的内耗与介电弛豫研究

金属学报, 2003, 39(11): 1133-1138. doi: 10.3321/j.issn:0412-1961.2003.11.004

La2Mo2O9系新型氧离子导体中氧空位扩散的内耗与介电弛豫研究

方前锋 ^1, , 王先平 ^2, , 易志国 ^3, , 张国光 ^4,

1.中国科学院固体物理研究所材料物理重点实验室,合肥,230031

2.中国科学院固体物理研究所材料物理重点实验室,合肥,230031

3.中国科学院固体物理研究所材料物理重点实验室,合肥,230031

4.中国科学院固体物理研究所材料物理重点实验室,合肥,230031

基金项目: 国家自然科学基金(10174083,50202012)

关键词：氧离子导体 , 固体氧化物燃料电池 , 钼酸镧 , 内耗 , 介电弛豫

INTERNAL FRICTION AND DIELECTRIC RELAXATION STUDIES ON THE OXYGEN VACANCY DIFFUSION IN THE NOVEL La2Mo2O9-BASED OXIDE-ION CONDUCTORS

报道了用内耗和介电弛豫方法研究新型氧离子导体La2-xAxMo2O9(其中,A=Ca,Bi,K;x=0-0.3)的最新结果.结果表明,在内耗-温度谱和介电损耗-温度谱上出现了两个与氧空位短程扩散有关的内耗峰和介电弛豫峰,说明氧空位扩散至少有两个不等同的弛豫过程.掺杂后,两弛豫峰都移向高温,氧空位的扩散激活能增加,高温弛豫峰高度降低而低温弛豫峰略有升高.在适当的掺杂条件下(30%Ca,5%Bi或5%K),低温下的电导率都有不同程度的提高.根据实验结果和晶体结构提出了氧空位(或离子)扩散的物理图像.

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La2Mo2O9系新型氧离子导体中氧空位扩散的内耗与介电弛豫研究

INTERNAL FRICTION AND DIELECTRIC RELAXATION STUDIES ON THE OXYGEN VACANCY DIFFUSION IN THE NOVEL La2Mo2O9-BASED OXIDE-ION CONDUCTORS

参考文献